US9680237B2 - Spring-force clamping element with pivoting lever - Google Patents

Spring-force clamping element with pivoting lever Download PDF

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Publication number
US9680237B2
US9680237B2 US14/782,327 US201414782327A US9680237B2 US 9680237 B2 US9680237 B2 US 9680237B2 US 201414782327 A US201414782327 A US 201414782327A US 9680237 B2 US9680237 B2 US 9680237B2
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United States
Prior art keywords
clamping
spring
release lever
conductor
housing
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Active
Application number
US14/782,327
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English (en)
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US20160049737A1 (en
Inventor
Stefan Aporius
Constantin Classen
Dirk Hanke
Sascha Nolte
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weidmueller Interface GmbH and Co KG
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Weidmueller Interface GmbH and Co KG
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Assigned to WEIDMUELLER INTERFACE GMBH & CO. KG reassignment WEIDMUELLER INTERFACE GMBH & CO. KG ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: CLAUSSEN, CONSTANTIN, HANKE, DIRK, APORIUS, STEFAN, NOLTE, SASCHA
Publication of US20160049737A1 publication Critical patent/US20160049737A1/en
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/48—Clamped connections, spring connections utilising a spring, clip, or other resilient member
    • H01R4/4809—Clamped connections, spring connections utilising a spring, clip, or other resilient member using a leaf spring to bias the conductor toward the busbar
    • H01R4/4828—Spring-activating arrangements mounted on or integrally formed with the spring housing
    • H01R4/48365—Spring-activating arrangements mounted on or integrally formed with the spring housing with integral release means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/28—Clamped connections, spring connections
    • H01R4/48—Clamped connections, spring connections utilising a spring, clip, or other resilient member
    • H01R4/4809—Clamped connections, spring connections utilising a spring, clip, or other resilient member using a leaf spring to bias the conductor toward the busbar
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R13/00—Details of coupling devices of the kinds covered by groups H01R12/70 or H01R24/00 - H01R33/00
    • H01R13/62—Means for facilitating engagement or disengagement of coupling parts or for holding them in engagement
    • H01R13/629—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances
    • H01R13/633—Additional means for facilitating engagement or disengagement of coupling parts, e.g. aligning or guiding means, levers, gas pressure electrical locking indicators, manufacturing tolerances for disengagement only
    • H01R4/4836—

Definitions

  • the present invention relates to a spring-biased connector including a housing having a chamber containing a conductive bus bar, and a clamping spring normally having an expanded clamping condition for biasing a conductor bare end toward electrical engagement with the bus bar.
  • a release lever is pivotally connected with the housing for displacement from a normal closed clamping position toward an open position, whereby a lateral projection on the clamping lever operates the clamping spring from the expanded clamping condition toward a compressed open condition, thereby to permit removal of the conductor bare end from the housing chamber.
  • the electric conductors are solid wire conductors, stranded conductors, or conductive sleeves, for example, in which stranded conductors are clamped, in order to protect the strands from damage.
  • the wires of the conductor are usually made of a copper-containing material or copper, and are relatively soft as compared to the spring steel used for the clamping springs. In this connection, the miniaturization of the electronics requires ever new installation space-saving concepts.
  • the Chiang U.S. Pat. No. 8,262,422 B1 discloses a spring-biased clamping element, in which an electric conductor is clamped at a clamping point in a spring housing between a bus bar and a spring arm.
  • the spring arm is pivotable about a fixed axis.
  • the spring arm includes an extension, on the outside of which a connecting piece is provided, which engages in a groove of a lever pivotable about this same axis.
  • the spring arm with the lever is pivotable against its restoring force and the electric conductor may be removed from the spring housing.
  • the present invention was developed to provide an alternative spring-force clamping element, which requires less installation space, in particular, less installation depth, ensures proper clamping of an electric conductor in the spring-force clamping element, and allows for an easy opening of the clamping point.
  • an improved compact spring-biased connector arrangement including a housing having a chamber containing a conductive bus bar, a clamping spring normally having an expanded clamping condition for biasing a conductor bare end toward electrical engagement with the bus bar, and a release lever pivotally connected with the housing for displacement from a normal closed clamping position toward an open position, whereby a lateral projection on the clamping lever operates the clamping spring toward a compressed open condition, thereby to permit removal of the conductor bare end from the housing chamber.
  • a spring-biased clamping arrangement including a spring housing having an insertion region for inserting an electrical conductor into the housing chamber, wherein a bus bar and a clamping spring are disposed in the spring housing in such a way that an electric conductor inserted through the insertion region into the spring housing may be clamped at a clamping point between the clamping spring and the bus bar, wherein the spring-force clamping element also includes a pivoting lever, which may be pivoted in a pivot direction about a pivot axis in order to open the clamping point, and which has a lateral operating projection, which presses the clamping spring in the pivot direction when opening the clamping point.
  • a spring-biased clamping element of this type is used preferably as a printed circuit board clamp.
  • the spring-biased clamping element is distinguished by the fact that the lateral operating projection is disposed between the insertion region of the spring housing and the clamping spring. As a result, the lateral operating projection is disposed in the interior space of the spring housing adjacent the pivot axis of the release lever.
  • the clamping spring need be designed no wider than is required for the conductor diameter of the electric conductor clamped by the spring-biased clamping element. As a result, the installation thickness of the spring-biased clamping element is adapted to the conductor diameter.
  • the insertion region of the housing is preferably funnel-shaped or cylindrical-shaped in design.
  • the lateral operating projection is also preferably designed as a contact surface.
  • other shapes of the insertion region and/or of the contact geometry are also possible.
  • the clamping spring includes a clamping leg that is pivotable about the pivot axis of the release lever. It also preferably includes a stationary support leg, which is braced against the spring housing and/or against a cage clamp when the clamping leg is pivoted.
  • the clamping spring is particularly preferably designed as a leaf spring. It is even more preferably made of a spring steel.
  • the lateral operating projection is at least partially flat in engagement with the clamping leg, at least when the clamping point is opened.
  • the force acting on the spring clamping leg is uniformly distributed on the latter in the region of the lateral operating projection.
  • a lever guide is preferably provided on the spring housing, thereby to guide the lever during its pivotal opening operation. This prevents a twisting of the pivoting lever during opening and safely actuates the clamping spring leg.
  • the release lever preferably includes a mounting end and an operating end, with the lateral operating projection being disposed between the mounting and operating ends. It has preferably a generally U-shaped design, so that it may be properly and compactly integrated into the construction.
  • the release lever is preferably mounted at its pivot end, and on its end, is provided with an operating handle. Alternatively, it could be semi-circular in design. This makes an approximately linear actuation via the actuation angle possible.
  • the lateral operating projection is disposed between the release lever ends, and preferably adjacent the mounting end.
  • an open end of the clamping limb is freely movable when the clamping point is opened, thereby making it easy to remove the electrical conductor.
  • the pivoting lever is preferably mounted on the axial limb so as to be rotatable about the pivot axis.
  • An actuating surface is also preferably provided on the actuating leg. In this way, the mechanical advantage is proved that lever travel is relatively long and the force required for actuating the clamping limb is relatively minimal. It is preferable that the actuating surface be designed for actuation with or without the use of an actuating tool.
  • the spring clamping limb preferably includes a first bend at the open end, as well as a second bend adjacent the lateral operating projection.
  • the clamping leg portion between the first bend and the second bend extends virtually transversely to the clamped electrical conductor, respectively. This allows for a low installation height.
  • an obtuse angle is also formed between the clamping limb and the electrical conductor, and the clamped electrical conductor cannot be removed from the spring-biased clamping element and is securely clamped.
  • the open end of the clamping leg points in the conductor insertion direction. In this way, the electrical conductor may be inserted into and clamped undamaged in the spring housing.
  • a guide support projection which in an assembled state of the spring-biased clamping element is disposed between the clamping le and the support leg of the clamping spring.
  • the guide support projection is disposed in the interior chamber of the spring housing and does not increase the installation height.
  • a guide groove for the clamping spring is formed between the operating later projection and the guide support projection.
  • FIG. 1 is an exploded perspective view of the spring-biased clamping connector of the present invention
  • FIGS. 2 a -2 c are front elevation views of the apparatus with certain parts removed, and FIGS. 2 d -2 f are corresponding front perspective views;
  • FIGS. 3 a and 3 b are rear perspective and rear elevation views, respectively of the invention with certain parts removed
  • FIGS. 3 c and 3 d are rear perspective and rear elevation views of the invention with certain parts removed
  • FIGS. 4 a -4 d are detailed rear perspective views of the release lever arrangement.
  • the connector arrangement 1 of the present invention includes a housing 2 formed of a non-conductive synthetic plastic material, and includes a vertical bottom wall and side walls cooperating to define a chamber 20 in which are mounted a conductive cage member 3 and a clamping spring 4 .
  • the front of the chamber is partially closed by a release lever 5 that is pivotally connected with the housing by a pivot shaft 60 .
  • An access opening 21 is provided in the side walls of the housing to permit the bare end of an insulated conductor 8 to be inserted into and removed from the housing chamber 20 .
  • the conductor 8 can be a single-wire conductor, or a braided wire conductor.
  • a protective funnel-shaped conductive support sleeve 7 is provided for introducing the bare conductor end into the housing chamber 20 .
  • the conductive cage member 3 has a generally U-shaped configuration including a vertical rear wall 35 adjacent the chamber bottom wall, and a pair of vertical side walls 32 and 33 .
  • the side wall 32 is provided with a lower support ledge 321
  • the side wall 33 which serves as a bus bar, is provided with a contact rib 34 .
  • the cage 3 includes a lower contact portion 31 having a horizontal wall that is seated on a horizontal cross-support 22 on the housing 2 , and a plurality of pin contacts 311 that extend downwardly and outwardly from the housing.
  • the clamping spring 4 which is formed from spring steel or the like, is a compression spring having a generally inverted V-shaped configuration defining a clamping leg 41 joined to a support leg 42 by a connecting portion 46 .
  • the connecting portion 46 is supported by the enlarged portion 26 of a horizontal pivot shaft 60 the rear end of which is connected with the bottom wall of the housing chamber 20 .
  • the spring support leg 42 abuts the support ledge 321 on the cage side wall 32 .
  • the spring clamping leg 41 contains a first bend 45 that defines leg portions 41 a and 41 b that are arranged at an obtuse angle, and a second bend 43 that defines a terminal tab 44 at the end of the clamping leg portion 41 b .
  • the terminal tab portion 44 of the spring clamping leg 41 normally engages the conductor support sleeve 7 and biases the same toward conductive engagement with the bus bar 33 .
  • the release lever 5 has a generally U-shaped configuration, and includes a mounting leg 56 and an operating leg 57 joined by a connecting portion 58 .
  • the mounting leg 56 contains a pivot opening 51 by means of which the release lever is pivotally supported on the pivot shat 60 for pivotal movement about the fixed pivot axis 6 .
  • the mounting arm 56 carries the lateral operating projection 52 that engages the clamping leg portion 41 a , as best shown in FIGS. 4 a -4 c .
  • the operating leg 57 carries the handle portion 53 which contains an operating recess 54 for receiving an operating tool, such as the tip of a screwdriver.
  • the clamping spring 4 is normally in the unstressed expanded clamping condition shown in FIGS. 1, 3 a and 4 a , whereupon the release lever 5 is in its initial closed clamping position with the spring clamping leg biasing the conductor sleeve 7 toward conductive engagement with the bus bar 33 .
  • the conductor 8 is thus connected with the pin terminals 311 for soldered connection with the desired distribution conductors (not shown).
  • the user applies—either manually or by an operating tool—a downward force 59 ( FIG. 4 a ) to the handle portion 53 , thereby to pivot the release lever 5 in the direction 61 of FIG. 1 .
  • the lateral operating projection 52 applies pressure to the spring clamping leg portion 41 a to compress the clamping spring and thereby displace the tab extremity 44 away from the conductor support sleeve 7 , thereby to permit removal of the sleeve and the conductor from the housing 2 .
  • the clamping spring expands to it normal unstressed condition, and the clamping leg 41 pivotally returns the release lever to its initial closed position.
  • the cage clamp 3 is accessible through an insertion region 21 provided in the spring housing 2 .
  • the spring housing 2 is preferably made of an electrically insulating material, preferably a synthetic plastic material, and may be designed as part of a primary housing, for example, of a terminal block.
  • the cage clamp 3 is preferably made of an electrically well-insulating metal, preferably of a copper-containing metal or of copper.
  • the V-shaped clamping spring 4 is designed as a leaf spring. It includes a clamping leg 41 and a support leg 42 , which are connected to one another by an approximately semicircular connecting portion 46 .
  • the clamping spring 4 is preferably manufactured from spring steel.
  • the clamping spring 4 is guided around the holding contour 26 in the region of the connecting portion 46 .
  • the pivot shaft 60 designed in approximately the center of the cross limb 46 , extends concentrically about the pivot axis 6 and forms a pivot shaft. In this way, the spring clamping leg 41 is pivotable about the pivot axis 6 .
  • the preferably U-shaped cage clamp 3 includes a bus bar 33 , which is disposed transversely to a rear wall 35 of the cage clamp 3 .
  • a side wall 32 on which a support piece 321 is provided, is formed opposite the bus bar 33 transversely to the rear wall 35 .
  • an integral connecting piece 31 on which, in this case, four connector pins 311 are provided for connection with electric conductors (not shown).
  • the connector pins 311 shown here are designed as solder pins. Other connectors are also possible, however, for example, a contact spring or a contact pin or differently designed connectors, which allow for soldering, clamping, inserting or the like.
  • the configuration of the connecting piece 31 , of the connector pins 311 or other connectors is selected in accordance with the existing installation space.
  • the cage member 3 may be inserted into the interior space 20 of the spring-force clamping element 1 above a cross piece 22 of the spring housing 2 .
  • the connector pins 311 are guided outwardly, so that the interior space 20 remains free for the clamping spring 4 and an electric conductor support sleeve 7 (see FIG. 2 ) inserted into the spring housing 2 . Furthermore, the connector pins 311 are accessible from the outside as a result.
  • the electric conductor support sleeve 7 may be inserted between the spring clamping leg 41 and the bus bar 33 .
  • the electric conductor is forced by the clamping leg 41 opposite the pivot direction 61 against the bus bar 33 at a clamping point 40 , indicated here by an arrow.
  • the electric conductor support sleeve 7 shown here is, for example, a sleeve, in which a stranded or braided conductor is normally inserted.
  • the spring-biasing element may, however, also be used without a sleeve for a stranded conductor and for a solid wire conductor.
  • a release lever 5 is provided, in order to release the electric conductor 7 from the spring-biased connector and to remove the conductor in a direction opposite to the conductor insertion direction. With the release lever 5 , it is possible not only to release the electric conductor 7 from the spring-force clamping element 1 . Rather, the pivoting lever 5 is also provided for opening the clamping point 40 . It therefore allows the clamping point 40 to be opened before an electric conductor 8 , in particular, a thin-wire electric conductor 8 , is to be clamped in the spring-biased clamping arrangement 1 . With the clamping point 40 opened, it is very easy to insert the electric conductor sleeve 7 —or the conductor 8 directly—into the clamping point 40 .
  • the base portion 58 of the release lever 5 in this case is approximately U-shaped in design.
  • FIGS. 4 b and d illustrate that the U-shaped cage 3 of the pivoting lever are advantageously situated opposite one another, such that they form a kind of closed contour, which encompasses an inserted conductor, wherein the release lever 5 remains pivotable.
  • the release lever is disposed on the pivot shaft 60 and is mounted so as to be rotatable about the pivot axis 6 .
  • a through-hole 51 is provided, which extends concentrically about the pivot axis 6 , and which is mounted so as to be rotatable on the pivot shaft 60 .
  • Differently shaped release levers 5 for example, a semicircular or a V-shaped release lever 5 , are also conceivable.
  • the operating leg 57 of the release lever 5 also includes an actuating handle portion 53 .
  • the pivoting lever 5 may be actuated manually at the actuating handle 53 .
  • a recess 54 for an actuating tool (not shown) is provided so that there, too, the release lever 5 may be actuated using the actuating tool, for example, a screw driver.
  • actuating handle 53 instead of an actuating handle 53 , however, a more compact actuating surface 53 is preferred, which allows only one actuation using an actuating tool.
  • a lateral operating projection contact geometry 52 is provided between the mounting leg 56 and the operating leg 57 .
  • the lateral operating projection 52 is disposed between the clamping limb 41 and the insertion region 21 . As a result, it is disposed in the interior space 20 of the spring-biased connector arrangement 1 and does not increase the installation depth of the arrangement.
  • the lateral operating projection 52 has a flat design and fits at least partially flat against the clamping leg 41 , at least when opening the clamping point 40 , i.e., when pivoting the release lever 5 in the pivot direction 61 .
  • the force is evenly distributed on the clamping leg 41 in the region of the lateral operating projection 52 .
  • it does not break as a result when actuating the pivoting lever.
  • the clamping leg 41 Due to the restoring force of the clamping spring 4 , the clamping leg 41 is automatically pivoted back opposite the pivot direction 61 when the electric conductor sleeve 7 is removed from the spring-biased connector 1 , and the release lever 5 is no longer acted upon by any actuating force.
  • the clamping leg 41 at this point fits partially against the lateral operating projection 52 and presses on the projection 52 opposite the pivot direction 61 , so that the release lever 5 is pivoted back by the clamping spring 4 .
  • a guide projection contour 55 ( FIG. 4 a ), which in the assembled state of the spring-biased connector 1 is disposed between the clamping leg 41 and the support leg 42 .
  • a guide groove 551 (see FIG. 2 b ) is formed between the lateral operating projection 52 and the guide projection 55 , in which the clamping leg 41 is safely guided when pivoted.
  • a lever guide arrangement 23 is provided on the housing 2 , so that the installation depth of the spring-biased connector 1 is not increased unnecessarily by the release lever 5 . During pivoting, the release lever 5 is guided along the lever guide 23 . The lever guide arrangement 23 also prevents the release lever 5 from freely pivoting when the electric conductor sleeve 7 is connected.
  • the clamping leg 41 includes a first bend 43 and a second bend 45 .
  • the first bend 43 is provided at an open end 44 of the clamping limb 41 .
  • the second bend 45 is provided in the region of the contact geometry 52 .
  • the clamping limb 41 between the first bend 43 and the second bend 45 extends virtually transversely to the clamped electric conductor 7 , respectively, the conductor insertion direction 8 .
  • the installation height is minimal as a result.
  • an obtuse angle is formed between the clamping limb 41 and the electric conductor 7 , and securely clamps the conductor in the spring-force clamping element 1 .
  • the direction of the installation depth 81 , the installation width 82 and the installation height 83 are shown in FIGS. 2 and 3 .
  • FIGS. 4 ( a ) and ( c ) show a base position G of the clamping spring 4 , in which no electric conductor 7 is inserted in the spring housing 2 .
  • the clamping leg 41 extends approximately transversely to the conductor insertion direction.
  • FIG. 4 ( b ) shows an assembly position M of the clamping spring 4 , in which an electric conductor sleeve 7 is inserted into the spring housing 2 and clamped in said housing between the open end 44 of the clamping leg 41 and the bus bar 33 .
  • the electrically conductive end of the sleeve 7 is identified here by the reference numeral 71 .
  • FIG. 4( d ) shows an open position O of the clamping spring 4 , in which the clamping leg 41 and the release lever 5 are pivoted as far as possible in the pivot direction 61 .
  • This open position O is possible, only if the actuating force acts on the release lever 5 in the conductor insertion direction.
  • the actuating force is shown here by an arrow 9 .
  • catch means (not shown) in the spring-force clamping element 1 , so that the release lever 5 is locked in place in the open position O.

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  • Details Of Connecting Devices For Male And Female Coupling (AREA)
US14/782,327 2013-04-15 2014-04-14 Spring-force clamping element with pivoting lever Active US9680237B2 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
DE202013101582.2 2013-04-15
DE202013101582U 2013-04-15
DE202013101582.2U DE202013101582U1 (de) 2013-04-15 2013-04-15 Federkraftklemmelement mit Schwenkhebel
PCT/EP2014/057531 WO2014170273A1 (de) 2013-04-15 2014-04-14 Federkraftklemmelement mit schwenkhebel

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US20160049737A1 US20160049737A1 (en) 2016-02-18
US9680237B2 true US9680237B2 (en) 2017-06-13

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Application Number Title Priority Date Filing Date
US14/782,327 Active US9680237B2 (en) 2013-04-15 2014-04-14 Spring-force clamping element with pivoting lever

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US (1) US9680237B2 (zh)
EP (1) EP2987205B1 (zh)
JP (1) JP6440684B2 (zh)
CN (1) CN105122550B (zh)
DE (1) DE202013101582U1 (zh)
WO (1) WO2014170273A1 (zh)

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CN105122550A (zh) 2015-12-02
US20160049737A1 (en) 2016-02-18
EP2987205A1 (de) 2016-02-24
JP2016519404A (ja) 2016-06-30
WO2014170273A1 (de) 2014-10-23
JP6440684B2 (ja) 2018-12-19
CN105122550B (zh) 2019-02-12
DE202013101582U1 (de) 2014-07-16

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